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/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
package org.nd4j.linalg.api.buffer;
import lombok.NonNull;
import lombok.val;
import org.bytedeco.javacpp.BytePointer;
import org.bytedeco.javacpp.LongPointer;
import org.bytedeco.javacpp.Pointer;
import org.bytedeco.javacpp.indexer.ByteIndexer;
import org.bytedeco.javacpp.indexer.Indexer;
import org.bytedeco.javacpp.indexer.LongIndexer;
import org.nd4j.linalg.api.memory.MemoryWorkspace;
import org.nd4j.linalg.api.memory.pointers.PagedPointer;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collection;
/**
* UTF-8 buffer
*
* @author Adam Gibson
*/
public class Utf8Buffer extends BaseDataBuffer {
protected Collection references = new ArrayList<>();
protected long numWords = 0;
/**
* Meant for creating another view of a buffer
*
* @param pointer the underlying buffer to create a view from
* @param indexer the indexer for the pointer
* @param length the length of the view
*/
public Utf8Buffer(Pointer pointer, Indexer indexer, long length) {
super(pointer, indexer, length);
}
public Utf8Buffer(long length) {
super(length);
}
public Utf8Buffer(long length, boolean initialize) {
super(length, initialize);
}
public Utf8Buffer(long length, boolean initialize, MemoryWorkspace workspace) {
super(length, initialize, workspace);
}
public Utf8Buffer(int[] ints, boolean copy, MemoryWorkspace workspace) {
super(ints, copy, workspace);
}
public Utf8Buffer(ByteBuffer buffer, int length, long offset) {
super(buffer, length, offset);
}
public Utf8Buffer(byte[] data, long numWords) {
super(data.length, false);
val bp = (BytePointer) pointer;
bp.put(data);
this.numWords = numWords;
}
public Utf8Buffer(double[] data, boolean copy) {
super(data, copy);
}
public Utf8Buffer(double[] data, boolean copy, long offset) {
super(data, copy, offset);
}
public Utf8Buffer(float[] data, boolean copy) {
super(data, copy);
}
public Utf8Buffer(long[] data, boolean copy) {
super(data, copy);
}
public Utf8Buffer(long[] data, boolean copy, MemoryWorkspace workspace) {
super(data, copy, workspace);
}
public Utf8Buffer(float[] data, boolean copy, long offset) {
super(data, copy, offset);
}
public Utf8Buffer(int[] data, boolean copy, long offset) {
super(data, copy, offset);
}
public Utf8Buffer(int length, int elementSize) {
super(length, elementSize);
}
public Utf8Buffer(int length, int elementSize, long offset) {
super(length, elementSize, offset);
}
public Utf8Buffer(DataBuffer underlyingBuffer, long length, long offset) {
super(underlyingBuffer, length, offset);
}
public Utf8Buffer(@NonNull Collection strings) {
super(Utf8Buffer.stringBufferRequiredLength(strings), false);
// at this point we should have fully allocated buffer, time to fill length
val headerLength = (strings.size() + 1) * 8;
val headerPointer = new LongPointer(this.pointer);
val dataPointer = new BytePointer(this.pointer);
numWords = strings.size();
long cnt = 0;
long currentLength = 0;
for (val s: strings) {
headerPointer.put(cnt++, currentLength);
val length = s.length();
val chars = s.toCharArray();
// putting down chars
for (int e = 0; e < length; e++) {
val b = (byte) chars[e];
val idx = headerLength + currentLength + e;
dataPointer.put(idx, b);
}
currentLength += length;
}
headerPointer.put(cnt, currentLength);
}
public Utf8Buffer(ByteBuffer buffer, int length) {
super(buffer, length);
}
public String getString(long index) {
if (index > numWords)
throw new IllegalArgumentException("Requested index [" + index + "] is above actual number of words stored: [" + numWords + "]");
val headerPointer = new LongPointer(this.pointer);
val dataPointer = (BytePointer) (this.pointer);
val start = headerPointer.get(index);
val end = headerPointer.get(index+1);
if (end - start > Integer.MAX_VALUE)
throw new IllegalStateException("Array is too long for Java");
val dataLength = (int) (end - start);
val bytes = new byte[dataLength];
val headerLength = (numWords + 1) * 8;
for (int e = 0; e < dataLength; e++) {
val idx = headerLength + start + e;
bytes[e] = dataPointer.get(idx);
}
try {
return new String(bytes, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
@Override
protected DataBuffer create(long length) {
return new Utf8Buffer(length);
}
@Override
public DataBuffer create(double[] data) {
throw new UnsupportedOperationException();
}
@Override
public DataBuffer create(float[] data) {
throw new UnsupportedOperationException();
}
@Override
public DataBuffer create(int[] data) {
throw new UnsupportedOperationException();
}
private static long stringBufferRequiredLength(@NonNull Collection strings) {
// header size first
long size = (strings.size() + 1) * 8;
for (val s:strings)
size += s.length();
return size;
}
public void put(long index, Pointer pointer) {
throw new UnsupportedOperationException();
//references.add(pointer);
//((LongIndexer) indexer).put(index, pointer.address());
}
/**
* Initialize the opType of this buffer
*/
@Override
protected void initTypeAndSize() {
elementSize = 1;
type = DataType.UTF8;
}
}
